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Title: Structure and decay correlations of two-neutron systems beyond the dripline

The two-neutron unbound systems of 16Be, 13Li, 10He, and 26O have been measured using the Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet setup. The correlations of the 3-body decay for the 16Be and 13Li were extracted and demonstrated a strong correlated enhancement between the two neutrons. The measurement of the 10He ground state resonance from a 14Be(-2p2n) reaction provided insight into previous predictions that wavefunction of the entrance channel, projectile, can influence the observed decay energy spectrum for the unbound system. Lastly, the decay-in-target (DiT) technique was utilized to extract the lifetime of the 26O ground state. The measured lifetime of 4.5$$+1.1\atop{-1.5}$$ (stat.)±3(sys.) ps provides the first indication of two-neutron radioactivity.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [4] ;  [9] ;  [3] ;  [3] ;  [3] ;  [3] ;  [10] ;  [3] ;  [3] ;  [3] ;  [11]
  1. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry
  2. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
  4. Hope College, Holland, MI (United States). Dept. of Physics
  5. Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics
  6. Ohio Wesleyan Univ., Delaware, OH (United States). Dept. of Physics and Astronomy
  7. Indiana Univ., South Bend, IN (United States). Dept. of Physics and Astronomy
  8. Augustana College, Rock Island, IL (United States). Dept. of Physics & Astronomy
  9. Concordia College, Moorhead, MN (United States). Dept. of Physics
  10. Gettysburg College, Gettysburg, PA (United States). Dept. of Physics
  11. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
Publication Date:
Grant/Contract Number:
NA0000979; PHY11-02511
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 569; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Research Org:
Univ. of California, Berkeley, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1454784

Kohley, Z., Baumann, T., Bazin, D., Christian, G., De Young, P. A., Finck, J. E., Haring-Kaye, R. A., Hinnefeld, J., Frank, N., Lunderberg, E., Luther, B., Mosby, S., Peters, W. A., Smith, J. K., Snyder, J., Stephenson, S. L., Strongman, M. J., Spyrou, A., Thoennessen, M., and Volya, A.. Structure and decay correlations of two-neutron systems beyond the dripline. United States: N. p., Web. doi:10.1088/1742-6596/569/1/012033.
Kohley, Z., Baumann, T., Bazin, D., Christian, G., De Young, P. A., Finck, J. E., Haring-Kaye, R. A., Hinnefeld, J., Frank, N., Lunderberg, E., Luther, B., Mosby, S., Peters, W. A., Smith, J. K., Snyder, J., Stephenson, S. L., Strongman, M. J., Spyrou, A., Thoennessen, M., & Volya, A.. Structure and decay correlations of two-neutron systems beyond the dripline. United States. doi:10.1088/1742-6596/569/1/012033.
Kohley, Z., Baumann, T., Bazin, D., Christian, G., De Young, P. A., Finck, J. E., Haring-Kaye, R. A., Hinnefeld, J., Frank, N., Lunderberg, E., Luther, B., Mosby, S., Peters, W. A., Smith, J. K., Snyder, J., Stephenson, S. L., Strongman, M. J., Spyrou, A., Thoennessen, M., and Volya, A.. 2014. "Structure and decay correlations of two-neutron systems beyond the dripline". United States. doi:10.1088/1742-6596/569/1/012033. https://www.osti.gov/servlets/purl/1454784.
@article{osti_1454784,
title = {Structure and decay correlations of two-neutron systems beyond the dripline},
author = {Kohley, Z. and Baumann, T. and Bazin, D. and Christian, G. and De Young, P. A. and Finck, J. E. and Haring-Kaye, R. A. and Hinnefeld, J. and Frank, N. and Lunderberg, E. and Luther, B. and Mosby, S. and Peters, W. A. and Smith, J. K. and Snyder, J. and Stephenson, S. L. and Strongman, M. J. and Spyrou, A. and Thoennessen, M. and Volya, A.},
abstractNote = {The two-neutron unbound systems of 16Be, 13Li, 10He, and 26O have been measured using the Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet setup. The correlations of the 3-body decay for the 16Be and 13Li were extracted and demonstrated a strong correlated enhancement between the two neutrons. The measurement of the 10He ground state resonance from a 14Be(-2p2n) reaction provided insight into previous predictions that wavefunction of the entrance channel, projectile, can influence the observed decay energy spectrum for the unbound system. Lastly, the decay-in-target (DiT) technique was utilized to extract the lifetime of the 26O ground state. The measured lifetime of 4.5$+1.1\atop{-1.5}$ (stat.)±3(sys.) ps provides the first indication of two-neutron radioactivity.},
doi = {10.1088/1742-6596/569/1/012033},
journal = {Journal of Physics. Conference Series},
number = ,
volume = 569,
place = {United States},
year = {2014},
month = {12}
}